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gd5052
Joined: 04 Sep 2010
Posts: 5
Location: Effingham, Illinois
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 Posted: Sun Sep 05, 2010 4:43 am Post subject: Corvair install |
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Has anyone considered installing a corvair engine on a MarkIII?
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Gary Cornell |
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neilsenrm(at)gmail.com
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| Posted: Sun Sep 05, 2010 5:22 am Post subject: Corvair install |
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Gary
I would think the corvair is too heavy. The primary problem would be that no one makes a redrive for the corvair.
Rick Neilsen
Redrive VW Powered MKIIIC
On Sun, Sep 5, 2010 at 8:43 AM, gd5052 <gdcornell54(at)hotmail.com (gdcornell54(at)hotmail.com)> wrote:
[quote]--> Kolb-List message posted by: "gd5052" <gdcornell54(at)hotmail.com (gdcornell54(at)hotmail.com)>
Has anyone considered installing a corvair engine on a MarkIII?
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Gary Cornell
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=311415#311415
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Matt Dralle, List Admin.
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mdnanwelch7(at)hotmail.co
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| Posted: Sun Sep 05, 2010 5:26 am Post subject: Corvair install |
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Gary,
Although someone may have thought about it, I doubt it is a good idea for several
reasons.
First of all, the Corvair engine is a 6 cylinder, which means it's fairly big and heavy.
Second, it would have to be a direct drive to spin the prop, otherwise it would be
incredibly way too heavyby the addition of a redrive system!! A direct drive prop would
need to spin at least 3000 rpm,to allow the engine to come remotely close to it's torque curve,
and that makes for an VERY loud and annoying prop.
Third, the fuel burn for a Corvair would likely be in the 4-5 gph range (at least) (at)3K rpm.
This would mean you'd have to install a custom made tank that would best be able to carry
15-18 gallons of fuel. Now, installing the larger fuel tank isn't the problem! It's the fact
that you have already exceeded your useful load with a "too big" of an engine, couple that
with the need to carry 100-125 lbs of fuel, and you've got a dog on your hands.
IMO, a guy could go on and on about why a Corvair engine on a MkIII is a bad idea, but
I think it pushes the envelope in being very practical. My opinion!! Other's may have a different
opinion, that ok with me.
IF a guy were inclined to go with an alternative engine (a non-Rotax OEM engine), you would
be MUCH better off with either a VW based engine (w/a redrive), or a Lycoming O-200.
Both of these engines push the maximum weight allowance, but again, IMO, would be better
than the Corvair.
BTW, I don't have anything against the Corvair engine for an Experimental Aircraft, I just think
the MkIII is not the appropriate airframe choice.
Personally, my recommendation would be the VW based engine with a redrive.
a)Reasonably priced ($6000-$8000)
b) Kolb factory talking about making it an acceptable option
c) cheap to maintain, ok on gas consumption
d) part availability by the millions (especailly from the HiPo dune buggy crowd).
Even if I had a Corvair engine lying around my shop, I can't imagine seriously considering
installing it on a Kolb MkIII.
Mike Welch
> Subject: Corvair install
[quote] From: gdcornell54(at)hotmail.com
Date: Sun, 5 Sep 2010 05:43:47 -0700
To: kolb-list(at)matronics.com
--> Kolb-List message posted by: "gd5052" <gdcornell54(at)hotmail.com>
Has anyone considered installing a corvair engine on a MarkIII?
--------
Gary Cornell
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=311415#311415
>==
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gd5052
Joined: 04 Sep 2010
Posts: 5
Location: Effingham, Illinois
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| Posted: Sun Sep 05, 2010 5:37 am Post subject: Re: Corvair install |
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I have another option and that would be a Harley Twin Cam B engine The 1550 cc makes 100HP and weighs in (at) 152 Lbs
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Gary Cornell |
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mdnanwelch7(at)hotmail.co
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| Posted: Sun Sep 05, 2010 5:56 am Post subject: Corvair install |
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> I have another option and that would be a Harley Twin Cam B engine The 1550 cc makes 100HP and weighs in (at) 152 Lbs
| Quote: |
--------
Gary Cornell
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Gary,
Much better choice.
Don't confuse facts about the Harley engine, tho. Facts like (at) what rpm does it get that
100 HP? If it gets it at 5000+ rpm, then you have to install a redrive, and it's no longer a
155 lb motor!! What is the fuel burn? Can you adapt a redrive to it, and if you can, THEN how
much would it weigh?
IMO, the Harley may be a reasonable idea. Just make sure you are realistic when you make an
apples and apples comparison to a different engine.
Another thing to remember about the Harley engine is the radial design. Weight and balance would
need to be taken into account, since more of the Harley engine would be "rearward". This may
not be a problem, just to something to think about.
I thought there was a problem with the Harley due to excess vibration. Check out Hogair's information.
Headed out to my shop, gotta finsh that instrument panel.
Mike Welch
GEO Metro 1.0L turbo
[quote][b]
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neilsenrm(at)gmail.com
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| Posted: Sun Sep 05, 2010 9:57 am Post subject: Corvair install |
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Gary
Yes the Harley engine weighs less and has the power but at what RPM? You need a prop RPM around 2000RPMs to swing a big enough prop to get the thrust needed for a Kolb MKIII. Yes you could swing a 58" prop up to 3000RPMs but you would need more than 100HP to get the same thrust.
Also a V twin has a nasty harmonics issue that is tough to deal with on a direct drive engine and much more difficult to deal with on a redrive. Valley Engineering had to get very creative to even make their Genrac V twin work at all.
Rick Neilsen
1st Redrive VW Powered MKIIIC
On Sun, Sep 5, 2010 at 9:37 AM, gd5052 <gdcornell54(at)hotmail.com (gdcornell54(at)hotmail.com)> wrote:
[quote]--> Kolb-List message posted by: "gd5052" <gdcornell54(at)hotmail.com (gdcornell54(at)hotmail.com)>
I have another option and that would be a Harley Twin Cam B engine The 1550 cc makes 100HP and weighs in (at) 152 Lbs
--------
Gary Cornell
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=311423#311423
t Un/Subscription,
www.matronics.com/Navigator?Kolb-List" target="_blank">http://www.matronics.com/Navigator?Kolb-List
ronics.com/" target="_blank">http://forums.matronics.com
Matt Dralle, List Admin.
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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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| Posted: Sun Sep 05, 2010 11:33 am Post subject: Re: Corvair install |
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As one who has owned, built, and raced a number of Corvair's over the years, I thought about it a lot. The weight is just too much: 225 pounds minimum. But in all other respects it would not be a bad choice at all, just too heavy.
Richard Pike
MKIII N420P (420ldPoops)
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elleryweld(at)aol.com
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| Posted: Sun Sep 05, 2010 12:43 pm Post subject: Corvair install |
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I have a Corvair engine in my shop and I wouldnt even think of installing it on a Mk3
Ellery Batchelder Jr.
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